82 



Instar V. Duration 10—20 days. Length 23—30 mm. For 

 this stage I made an exception where the drawings are concer- 

 ned. I did now draw the objects themselves under the microscope 

 with the aid of a camera, but took the outline of Jacob Hubner's 

 old frontispice (1766) and in this entered the different tubercula. 

 The changes are not so great as in instar IF. 

 Packard does not describe this stage (see p. 76). 

 Prothorax. The plumose setae have a length of 5 and 10 mm. 

 Bnd stand out above the short feathered setae. 

 Mesothorax and Metathorax. As in instar IV. 

 Abdomen 1. V. infrastiymalis has a tuft of bright yellow setae, 

 ± 7 mm. long, short plumed, for the rest as in instar IV. 

 Segm. 2=1. V. infrastigmalis is provided with a little group 

 of plumose setae, the length of which is + 7 mm. 

 y, 3 to 7 as in instar IV. 



„ 8. The V. subdorsales have a tuft of setae of different forms. 

 Between the short plumed setae which are more than 7 

 ram. long, we find plumose ones of a length of + 10 

 mm. and long feathered ones, ± 5 mm. long. Further as 

 in instar IV. 

 y, 9. The V. subdorsales are not united and have each a tuft 

 of very long, short plumed setae and some (2 to 4) plu- 

 mose ones, the length of which is 5 mm. 

 The differences between Packard's views and mine follow 

 here in a short synopsis. 

 Packard. 

 Setae are already spinose in instar I. 



The feathered setae towards the end of instar II on segment 8. 

 The plumed setae in proportion as large as on the full fed 

 caterpillar in instar III. They appear at the same time on the 

 prothorax and segment 8. 



Whole duration of all the-instars as caterpillar: 23 — 30 days. 

 Three moults. 



SCHIERBEEK. 



In instar II spinose or plumed setae for the first time. 



